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An Inverse Matrix Eigenvalue Problem for Constructing a Vibrating Rod

  • Hanif Mirzaei EMAIL logo , Vahid Abbasnavaz and Kazem Ghanbari
Published/Copyright: August 2, 2024

Abstract

The free longitudinal vibrations of a rod are described by a differential equation of the form ( P ( x ) y ) + λ P ( x ) y ( x ) = 0 , where P ( x ) is the cross section area at point x and λ is an eigenvalue parameter. In this paper, first we discretize this differential equation by using the finite difference method to obtain a matrix eigenvalue problem of the form 𝐀 Y = Λ 𝐁 Y , where 𝐀 and 𝐁 are Jacobi and diagonal matrices dependent to cross section P ( x ) , respectively. Then we estimate the eigenvalues of the rod equation by correcting the eigenvalues of the resulting matrix eigenvalue problem. We give a method based on a correction idea to construct the cross section P ( x ) by solving an inverse matrix eigenvalue problem. We give some numerical examples to illustrate the efficiency of the proposed method. The results show that the convergence order of the method is O ( h 2 ) .

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Received: 2024-01-04
Revised: 2024-06-24
Accepted: 2024-07-02
Published Online: 2024-08-02
Published in Print: 2025-04-01

© 2024 Walter de Gruyter GmbH, Berlin/Boston

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